Telephone



(No Model.)

P. SEILER. TELEPHONE. No. 351,209. Patented Oct. 19, 1886.

NITED STATES PATENT Fries.

PAUL SEILER, OF SAN FRANCISCO, CALIFORNIA.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No 351,209, dated October 19, 1886.

Application filed February 20, 1885. Serial No.15G,5S3. (No model.)

To afZZ whom it may concern:

Be itknown that I, PAUL SEILER, of the city and county of San Francisco, State of California, have made and invented a new and useful means of transmitting and receiving sounds in the form of an electric acoustic telephone receiver and transmitter; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings.

My invention relates to a novel means of receiving and transmitting sounds by telephone without battery-transmit-ters in connection with telephone-receivers.

The following description fully explains the character of my invention and the manner in which I proceed to-construct, apply, use, and operate the same, the accompanying drawings being referred to by ligures and letters.

Figure l represents a vertical section, showing two diaphragms and the chain, wire, or cord connecting the same to transmit vibrations i'rom one diaphragm to the other, as in acoustic telephones. Fig. 2 represents two diaphragms and a steel magnet with a coil of wire, the same as are used in all telephone receivers. Fig. 3 shows a bead-chain connecting the diaphragms. Fig. 4 shows wire used for the same purpose.

The object of my invention is to increase the motion ofthe vibrating diaphragm of a telephone-receiver.

It is known that acoustic telephones are capable of giving, on short distances especially, a very loud and distinct repetition of speech. This fact led me to think that the connecting 1nedium--wire, cord, or chain-must eX- ert considerable force when set in motion by the diaphragm of the transmitter and produce considerable motion on the receiving-dia phragni. The ordinary Bell telephone-receiver, when made beyond a certain size, with a corresponding strong magnet, diminishes very much when it is used as transmitter, the cause being that the diaphragm is held too rigid, being under the influence of the magnet, so that the voice must be raised much above the pitch of ordinary conversation to be transmitted distinctly.

Referring to Fig. l, A is a diaphragm of 4over line H H.

Aany material ordinarily used in acoustic telephones; B, the wire or chain, and c a button to fasten the chain, which is a bead-chain and transmits with remarkable distinctness. This chain is attached to aniron button, D, or armature of magnet, and I use an iron diaphragm, E, and place a magnet, F, with coils of insulated wire G, in front of diaphragm E. In using diaphragm A as transmitter the chain B is set in motion and produces corresponding motion in diaphragm E in front of magnet F and coils G, which will transmit to the next station over line of wires H H. The operation is as follows: Diaphragm Avibrates chain B, which sets in motion diaphragm E and bntton D in front of magnet F and coils G, and induces a current in coil G, which is transmitted As a receiver this apparatus gives extraordinary results, and its Operation is as follows: The current of the distant telephone is received by thec'oil G, which causes diaphragmE to vibrate according to the power of the transmitting-telephone. Every vibration of diaphragm E is transmitted to diaphragm A, and this diaphragm is acted upon very acutely by the increased weight of chain B, the material in motion producing sounds loud enough to be heard without holding the ear to the receiver in the usual way. By this arrangement a more powerful transmitter is substituted than can be produced by talking directly against the iron diaphragm underthe immediate action of magnets, as is done in all Bell transmitters. This substitution dispenses with battery-transmitters.

In 2 is the apparatus with suitable frames for diaphragms A and E,and the chain B, running through the tube I,which is coinposed of two pieces connected by another tube, J. Both pieces of the main tube, as well as the connecting-tube, have right and left hand threads for the purpose of tightening the chain as required, in order to transmit well and to adjust the tube to the length ot' the chain. The frame K, made of brass or other material, holds magnet F and coil G in position over diaphragm E. L is another magnet, which is bifurcated at its upper end to receive two coils, M, arranged aspolarized bellcoils, magnet M and F furnishing polarity for the same by mag iet L carrying the coils M.

IOO

Armature N of coils M is suspended by the bracket 0, which is made of iron to furnish the required opposite polarity to armature, and is attached to magnet F, thus forming, combined, a .polarized bell and telephone receiver and transmitter and magnet and coils. The magnetic action in magnets F and L is connected through diaphragm E and on top of bracket O.

As I have explained, the object of my invention is to dispense with battery-transmitters in connection with telephonereceivers. I take two diaphragms-one of any kind of material and the other provided with an iron f armature or an iron diaphragm-and'place in a suitable position the steel magnet and coils to act on the iron diaphragm. It will be seen that any vibration in the iron diaphragm is transmitted to the other diaphragm in the same way as in any acoustic telephone; but as acoustic telephones transmit for short distancesmuch stronger than electric telephones the sound will be heard very distinctly in the diaphragm not under the influence of magnetism, because the vibrations are stronger from the action of the chain or wire. I And that on taking the similar magnet and coil of a Bell receiver out of the rubber case and placing them in the manner described I can hear very distinctly two feet from the instrument, While in using the same magnet and coil in the case, as usual, I have to place the ear close to the telephone to hear the voice. Another advantage is obtained by using two diaphragms-namely, as it is impossible to speak against that side of the diaphragm in a Bell receiver which is against the magnet, I use the other diaphragm in connection with a bead-chain, and speak into the top, as shown at P, Fig. 1. The pressure produced by the voice is used to better advantage to wrench the upper diaphragm .away from the magnet, by which stronger currents are induced in the coil of Wire, and they consequently transmit stronger than by speaking against a diaphragm which has thetensiou produced by the magnet. In comparing it experimentally with an ordinary Bell receiver, it was shown that the voice is heard ina room, and is heard distinctly two feetfrom th instrument. These tubes can be placed either vertical or horizontal; but the vertical position is preferred, because it takes less space andthe chain transmits clcarer and wit-hout metallic or rumbling noise.

Any number of monili and ear pieces may be used, and in some cases an nndulated wire may connect the diaphragms instead of a chain. This latter construction is more fully shown in Fig. 4.

Having thus fully described my invention7 what I claim, and desire to secure by Letters Patent, is-

The combination, with the tube B, having mouth and ear pieces, of the diaphragms arranged at each endof said tube, and connected' substantially as described, and the magnet F, provided with the coils G, and arranged above the diaphragm F, substantially as set forth. PAUL SEILER. [L s] Vitnesses:

GHAs. D. WHEAT, A. B. SMITH. 

